Arrangement for current sharing of parallel-connected converters

A power converter system, comprising

• two or more converter legs connected in parallel between a common dc system and a common ac system or between two common dc systems, wherein commutations of the parallel-connected converter legs are initiated by simultaneous commutation commands,
• a control arrangement configured to balance the current sharing between the parallel-connected converter legs,
• wherein the parallel-connected converter legs are auxiliary resonant commutated pole (ARCP) converter legs, particularly ARCP half-bridge legs, and wherein the control arrangement is configured to balance the current sharing between the parallel-connected ARCP converter legs by means of having an individual autonomous leg-specific boost current adjustment for each of the parallel-connected ARCP converter legs for adjusting boost currents in a direction that a differential output current is reduced, wherein each individual boost current adjustment is dependent on the magnitude of the leg current of the respective ARCP converter leg only such that, in an ARCP commutation mode A, the higher is the magnitude of the leg current the lower is the boost current and/or the shorter is a boost time, and in an ARCP commutation mode B, the higher is the magnitude of the leg current the higher is the boost current and/or the longer is the boost time.

A power converter system, comprising

• two or more converter legs connected in parallel between a common dc system and a common ac system or between two common dc systems, wherein commutations of the parallel-connected converter legs are initiated by simultaneous commutation commands,
• a control arrangement configured to balance the current sharing between the parallel-connected converter legs,
• wherein the parallel-connected converter legs are auxiliary resonant commutated pole (ARCP) converter legs, particularly ARCP half-bridge legs, and wherein the control arrangement is configured to balance the current sharing between the parallel-connected ARCP converter legs by means of having an individual autonomous leg-specific boost current adjustment for each of the parallel-connected ARCP converter legs for adjusting boost currents in a direction that a differential output current is reduced, wherein each individual boost current adjustment is dependent on the magnitude of the leg current of the respective ARCP converter leg only such that, in an ARCP commutation mode A the higher is the magnitude of the leg current the later and/or slower is the voltage swing, and in an ARCP commutation mode B, the higher is the magnitude of the leg current the earlier and/or faster is the voltage swing.